The BYU Mac Users Group has a useful post on securing your email:

Although most people don’t realize it, normal email is an open book for anyone that cares to look. When you send an email to someone, you’re basically sending them the electronic equivalent of a postcard, that can be read by anyone during its transit over the network…. There are several options for securing email and other forms of communication between computers.

Source: Secure Email on OS X

Additional reading:

S/MIME and Certificates
PGP and MacGPG

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